Nautel NX25, Operation And Maintenance Manual

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NX300 Operations and Maintenance Manual Operating the transmitter
Issue 3.0 2012-11-01 Page 2-37
Figure 2.23: Lissajous Plot
Lissajous plot.
See Figure 2.23 . This panel displays a Lissajous figure that represents either L (left)
and R (right) audio content or a representation of the digital modulation signal [I (in-phase) and Q
(quadrature)]. I and Q will be automatically selected unless you are operating in stereo mode or not
operating digital. Left and right audio content is displayed for all other audio sources.
The plot consists of a group of sequential samples to allow signal analysis. In L and R mode, the
L+R portion of the signal tends to dominate the plot, resulting in the majority of samples appearing
in the lower, left and upper, right quadrants. In I and Q mode, signals that are of equal frequency and
90 degrees out-of-phase result in a circular display.
Use the up or down button to maximize (if it was minimized) or minimize (if it was maximized) the
panel size.
L and R mode
I and Q mode